Brock
process of polymerizing butadiene in the presence
op lithium catalyst

ABSTRACT

1,3-BUTADIENE IS POLYMERIZED IN THE PRESENCE OF A HYDROCARBON LITHIUM CATALYST IN THE PRESENCE OF 400 TO 1500 PARTS, MORE OR LESS, OF AN ALPHA-ACETYLENE OR A LITHIUM ACETYLIDE CONTAINING 2 TO 8 CARBON ATOMS (CALCULATED AS ETHYL ACETYLENE) PER MILLION PARTS OF MONOMER AS A MODIFIER. THE AMOUNT OF CATALYST PRESENT IS IN SUBSTANTIAL EXCESS OVER THE STOICHIOMETRIC AMOUNT REQUIRED TO REACT WITH THE ALPHA-ACETYLENE TO PRODUCE LITHIUM ACETYLIDE. SUCH EXCESS IS SUFFICIENT TO INITITATE POLYMERIZATION AND PRODUCE POLYMER OF THE DESIRED MOLECULAR WEIGHT.

DEEENSWE PUBHCATTON UNITED STATES PATENT OFFICE Published at the requestof the applicant or owner in accordance with the Notice of Dec. 16,1969, S69 O.G. 687. The abstracts of Defensive Publication applicationsare identified by distinctly numbered series and are arrangedchronologically, The heading of each abstract indicates the number ofpages of specification, including claims and sheets of drawingscontained in the application as originally filed. The files of theseapplications are available to the public for inspection and reproductionmay be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Ofiice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED MARCH 21, 1972 a a c a t f G- MaL. wn

1,3-butadiene is polymerized in the presence of a hydrocarbon lithiumcatalyst in the presence of 400 to 1500 parts, more or less, of analpha-acetylene or a lithium acetylide containing 2 to 8 carbon atoms(calculated as ethyl acetylene) per million parts of monomer as amodifier. The amount of catalyst present is in substantial excess overthe stoichiometric amount required to react with the alpha-acetylene toproduce lithium acetylide. Such excess is sufficient to initiatepolymerization and produce polymer of the desired molecular weight.

